Reversing-engine.



PATENTED AUG. 2, 1904.

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I. PAWELL.

RBVERSING ENGINE.

APPLICATION FILED oo'Lzz, 1903.

No MODEL.

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REVERSING ENGINE.

APPLIOATION FILED 001222, 190s.

N0 MODEL.

3 SHEETS-SHEET 2.

No. 766,498. PATENTED AUG. 2, IQO4. '.I. FAWELL.

RBVERSING ENGINE.

APPLICATION FILED 0012.22-, 1903.

N0 MODEL. 3 SHEETS-SHEET 3.

WITN ESSES:

Patented August 2, 1904.

UNITED STATES PATENT OFFICE.

JOSEPH FAIVELL, OF PI'ITSBURG, PENNSYLVANIA.

REVERSlNG-ENGINE.

SPECIFICATION forming part of Letters Patent No. 766,498, dated August 2, 1904.

Application tiled October 22, 1903.

To all whom, it 'may concern:

Be it known that I, .Iosnrri FAwnLL, a citizen of the United States, residing at Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented or discovered certain new and useful Improvements in Reversing- Engines, of which improvements the following is a specification.

The invention described herein relates to certain improvements in cut-ofi' mechanism for engines, the improvements being' especially applicable to reversing-engines for rolling-mills. The engines for this purpose are so large as to render necessary the employment of power mechanism, such as a steamcylinder and piston, for shifting the link to reverse the engine. In operating' rollingmills the amount of d raft is continually varied as reduction proceeds, thus involving a variation in the power required to operate the mill. Then the link is operated by a steam-cylinder and piston, it cannot be checked in a satisfactory manner at intermediate points, so that an adjustment of cut-ofi' is practically impossible, as the engine and mill cannot be stopped while an article is being rolled toadjust the cut-ofi'. Hence it is customary to adjust the valves of the engine and their operating mechanism for the maximum load and to throttle the steam when the load is reduced. In order to avoid this uneconomical and, undesirable manner of operating' the engines, I have invented means whereby the cut-ofil may be adjusted as required from the pulpit, where the engineer stands to operate the engine, the pulpit being located usually some distance from the engine.

The invention is hereinafter more fully described and claimed.

In the accompanying drawings, forming a part of this specification, Figure 1 is a view, partly in elevation and partly in section, of a reversing-engine having my improvement applied thereto. Fig. 2 is a side elevation of my improved link and operating' mechanism. Fig. 3 is a view of the same, partly in front elevation and partly in section. Fig. I is an elevation illustrating a modification of my Serial No. 178,142. (No model.)

improvement. and Fig.' 5 is a sectional detail view.

In the drawings Ihave simply indicated the cylinder 1, valve-chamber 2, valve-rod 3, main shaft 4, and eccentric 5. 'I hcse parts can be constructed in any desired manner. The reversing mechanism consists of a cylinder 6, piston 7, and valve mechanism 8 controlling the flow of steam to and from the cylinder 6.

flhe piston-rod 9 is connected to the linkshifting mechanism through the sliding head l0 and the bar ll, which is pivotally connected to the sliding' head. This bar 11 is also pivotally connected to a block 12, movably mounted on the arm 13 and preferably arranged ina longitudinal slot 14 in the arm. This arm is formed or secured to a shaft 15, mounted in suitable bearings. Suitable means are employed whereby the rotation of the shaft 15 will change the point of connection of the valve-rod 3 with the link 16. In the construction shown the means employed for this purpose consist of arms 17 and 18, formed or secured to diametrically opposite sides of the shaft 15. One of these arms, as 17, is connected to the 'link 16, while the other arm, 18, is connected by a rod 19 to the block 20, movably mounted on the link. vWhile the valverod 3 may be connected directly to the linkblock 20, it is preferred to connect the valverod to an arm 21 on the rock-shaft 22, which is provided with another arm Q3, having' its end connected by a rod 24 to the link-block 20. The rod 19, leading from the arm 18, is connected to rod 24 rather than directly to the link-block. The link-block is connected, as usual, to the straps Q5 on the eccentrics by rods Q6.

It will be observed that any shifting of the arm 13 will produce a change in the relative positions of the link 16 and block 20, one of said parts in the construction shown being moved up and the other down. It has heretofore been the practice to so connect the bar 11 to arm 13 as to necessitate a stoppage of the engine to shift the point of connection of said parts one with the other when a variation of point of cut-ofi was desired. In order to avoid stopping the engine to. change the cut-olf while employing a reversing mechanism, as a steam-cylinder and piston incapable of movement less than full stroke, provision is made for shifting the block 12 along the arm 13. Adesirable construction to this end consists in connecting block 12 to arms 28 on the shaft 29, which is mounted in suitable bearings. On the rotation of the shaft 29 the block 12 will be shifted along the slot in the arm 13, thereby swinging said arm and the link, as the block is held from back-andforth movement by the bar 11. Any suitable means may be employed for rotating the shaft 29, as, for example, an electric motor 30.

In the construction shown in Figs. 1, 2, and 3 the electric motor is so secured to the arm 13 that its shaft may be detachably connected to a vshaft 31, provided with a worm engaging a worm-wheel 32 on shaft 29, mounted in bearings on the arm 13. When the motor and shaft 29 are carried by the arm 13, the

block 12 is connected by bars 27 to the arms 28 on the shaft.

In lieu of arranging the block-shifting mechanism on the arm 13 it may be arranged on a standard 33 adjacent to the arm 13 and connected to the block 12 by a iexible connection, as shown in Figs. 4 and 5. In this arrangement the bars 27 extend from the block 12 to a lever 34, to which they are pivotally attached. The motor 30 is secured on abracket 35 on the standard 33, and the arms 28 on the shaft 29, which is driven as described by the motor 30, are connected by rods 36 to the lever 34. By reasonof the relative positions of the parts of this mechanism and the arm 13 any movement of the arm 13 by its operatingcylinder will not materially change the relative positions of the arm and block 12.

As shown in Fig. 5, the motor-shaft is de- Y' tachably connected to the shaft 31. This can be done by making the end of the motor-shaft angular and inserting such angular end in a similarly-shaped socket in the shaft 31. This construction permits of the motor being removed in case of damage thereto and the shaft 31 to be rotated by hand, one end of the shaft being constructed to receive a wrench or other suitable handle. It will be observed that the worm-gearing serves to lock the mechanism, and consequently the block 12, in any position to which it may be adjusted.

In practice the switch controlling' the circuit of the motor 30 will be located in the pulpit or at other convenient point, so that the cut-olf mechanism will be always under the easycontrol of the engineer.

In practice the slot in the arm 13 will be made of such a length that the valve of the main engine can be adjusted from position of maximum admission to that of entire cut-off, which would result in the stoppage of the en- 4valve-operating mechanism and means for adjusting the val ve-operating mechanism during the operation of the engine while the reversing mechanism 1s stationary, substantially as set forth.

2. A reversing-engine having in combination therewith a valve, a link mechanism for operating said valve, means for shifting the link to reverse the engine and means for adjusting the link for varying the cut-off during the operation of the engine while the reversing mechanism is stationary, substantially as set forth.

3. A reversing-engine having in combination therewith a valve, a link mechanism for operating said valve, a power mechanism, connections between the power mechanism and the link and means for adjusting said connections to vary the movement of the valve, substantially as set forth.

4. A reversing-engine having in combination therewith a valve, a link mechanism for operating said valve, a power mechanism, a rock-shaft providedwith arms, rods connecting the arms respectively to the link and the power mechanism, and means carried by one of said arms to shift the point of attachment of the connecting-rod with the arm during the operation of the engine,substantially as set forth.

5. A reversing-engine having in combination therewith a valve, a link mechanism for operating the valve, a shaft provided with an arm connected to the link mechanism, a second arm on said shaft, a block movably mounted on said arm, a power mechanism connected to said block, and means carried by said arm for adjusting the block during the operation of the engine, substantially as set forth. j

6. A reversing-engine having in combination therewith a valve, a link mechanism for operating the valve, a shaft provided with an arm connected to the link mechanism, a second arm on said shaft, a block movably mounted on said arm, a power mechanism connected to said block, and a motor carried by said arm for adjusting the block, substantially as set forth. v

7. A reversing-engine having in combination therewith a valve, mechanism for operating said valve, mechanism for reversing the valve-operating mechanism, means for adjusting the valve-operating mechanism during the IOO IOS

IIO

operation of the engine While the reversing connections between the Valve-operating and 'IO mechanism is stationary and a lock for holdthe valve-reversing' mechanism.

'ing such mechanism in its cli'erent positions, In testimony whereof I have hereunto set substantially as set `toi-th. my hand. 5 8. A reversing-engine having in Combina- EPH F v A l' ELL. tion therewith a valve, mechanism adjustably JOS l Connected to the Valve-operating mechanism l/Vitnesses: Vfor reversing the latter and a motor having a DARWIN S. VoLoo'iT,

worm-aml-gear connection for adjusting the F. E. GAITHER. 

